What is a "Protected" tenancy and what does "Contracting Out" of the Landlord and Tenant Act 1954 mean?

The 1954 Act gives business tenants (in most circumstances) an automatic right to renew the tenancy at the end of the term. This "protection" is there to prevent the Landlord from unilaterally removing the Tenant at the end of the Term. However, the Landlord and Tenant can agree that this protection is "contracted out" of the 1954 Act. This means that the Tenant would not have an automatic right to renew at the end of the term. If the Landlord and Tenant agree to contract out, then a set procedure needs to be followed.